Stripper plate with lock nut



Feb. 13, 1951 v, oc 2,541,772

STRIPPER PLATE WITH LOCK NUT Filed Dec. 8, 1949 7. 2!.L0eka7'd INVENTOR1 1 BY 1 I Y I 1 ATTORNEYS Patented F eb. 13, 1951 UNITED STATES PATENTOFFICE STRIPPER PLATE WITH LOCK NUT Vene T. Lockard, Gladstone, Mich.,assignor of one-half to Agnes M. Gerue, Escanaba, Mich.

Application December 8, 1949, Serial No. 131,879

. 3 Claims. 1

This invention relates to a stripper plate with a lock nut, designedprimarily for use under the stripper plate on dies, although it isentirely possible that other uses of the nut may suggest themselves.

By way of background, it may be noted that in the die making art, it iswell known that a decided inconvenience and annoyance stems from theinability of the die maker to lock stripper bolts from the face of thedie, since many of these are located in the die where no wrench can beused. Additionally, conventionally shoulder bolts are used, this callingfor expensive and exacting work, in that shoulders and counterbores forsaid bolts must be exact. As the die is ground down, the shoulder boltsmust be shimmed down, as they become too long. Additionally, in the useof shoulder bolts, the bolt tends to work loose, in view of which thedie must be removed from the press to tighten the bolts. Obviously, theexpense of grinding rises considerably where a die must be dismantled tobe ground. Additionally, all bolts and holes must be numbered, since allmust be returned to their exact previous locations.

"In accordance with the present invention, it is proposed to use aspecially designed lock nut under the stripper plates, by the use ofwhich standard hollow head cap screws may be used as stripper boltsinstead of the special expensive shoulder bolts.

It is further proposed, by the use of said lock nut, to allow thegrinding of large dies without the necessity of dismantling the stripperplate with all its bolts, springs, etc.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts, hereinafter more fully describedand pointed out in the claims, it being understood that changes may bemade in the construction and arrangement of parts without departing fromthe spirit of the invention as claimed.

Referring to the drawings Fig. 1 is a fragmentary section taken througha stripper plate and die shoe showing the invention as used in the die.

Fig. 2 is a section taken substantially on line 2-2 of Fig. 1.

Fig. 3 is a fragmentary section taken through the stripper plate showinga modified arrangement.

Fig. 4 is a top plan view of a templet or drill jig embodied in theinvention.

Fig. 5 is a side elevational view of said templet. Referring to thedrawings in detail, 5 is a conventional die shoe, and 6 the conventionalstripper plate used in association therewith.

Formed in the die shoe is the smooth-walled bolt hole I formed with thecounterbore 8, and extending into said bolt hole 1 is the standardhollow head cap screw 9 formed with the head is seated in thecounterbore 8. The shank of the cap screw 9 has the threaded end Illthreaded into the threaded opening H formed in the stripper plate 6 andthreadable on said end IU of the bolt or cap screw 9 is the lock nutformed in accordance with the invention, the body of this nut beingformed at one end with the shroud l2 and at the other end with thecircumferential series of gear teeth 13.

For the purpose of rotating the lock nut, I provide the pinion rod Mextending through the bearing opening 15 formed in the stripper plate 6,the portion of said pinion rod l4 that extends below the bearing openingbeing formed with the circumferential series of gear teeth l6 meshingwith the gear teeth l3 of the lock nut. The lower end of said pinion rodM, as readily seen from Fig. 1, seats upon the shroud [2, so 'as toprevent the pinion rod Hi from moving downwardly through its bearingopening any more than is desired.

For the purpose of convenience in rotating the pinion rod M, the upperend of the pinion rod can be formed with a transverse opening in whichis slidable the handle l1.

Referring now to the form of the invention illustrated in Fig. 3, thestripper plate is here designated l8, and is formed with the threadedopening l9 receiving the cap screw 9. In this form of the invention,there is no difference in the construction of the cap screw, lock nut,and pinion rods, and. the main difference resides in the provision of apair of bearing openings 2| rather than a single bearing opening, sothat two pinion rods M can be used, one extending downwardly through thestripper plate on either side of the threaded opening, and theseengaging and meshing with the gear teeth of the lock nut at oppositesides of said lock nut. This provides extra locking power.

Referring no to Figs. 4 and 5, I have here illustrated a templet ordrill jig used to properly locate the bearing opening I5 relative to thethreaded opening I l of the stripper plate 6. This templet or drill jigis provided with an oblong body 22 adapted to rest upon the uppersurface of the stripper plate 6, this oblong body being In use, theparts appear as in Fig. 1. As may be noted, the key or rod I4 isinserted. through. the bearing opening [5, engaging the gear teeth I1 isnow rotated, and this v The stripper bolt 9 may now be tightened with astandard, wrench to.

I3. The handle loosens the lock nut.

bring the stripper plate down below the face of the die for grinding ofsaid die.

After the die is ground, the stripper bolts may be; releasedenough toobtain the proper. adjustment of the stripper plate, after which thebolts are: locked. in; position by. tightening of the. lock nut withthewrench- [4..

It has been. found; that. the formation: and

relative arrangement of parts illustrated and described. will eliminateall the; difficulties noted at the. beginning; of this description.

What is. claimed is:

1. The: combination, witha stripper. plate and die. shoe, of a, capscrew extending through the die shoe-andthreaded in the; stripper plate,the.

stripper plate having a smooth-walled opening adjacent. said.- capscrew, a toothed lock nut.

threaded. on the cap screw below the stripper plate, and a. toothed, rodextending throughsaid.

opening of. the stripper plate andmeshing with the lock nutfor rotating,said lock, nut.

2; The combination, with a stripper plate hav-- ing a, threaded openingand a smoothopening, a. die shoespaced from thestripper plate and havinga smooth. opening registering with the. threaded opening, and with acapscrew extend.- ing t'hroughthe smooth opening of.the die shoe. andthreaded in the. threaded openingv of the. stripper plate, of alocknutthreaded on the cap screw, and. disposed. between the. stripper plate.

and die. shoe, the lock nut having. one. side;

formed with a shroud constituting a wrench stop, the other side of saidcap screw being formed with a circumferential series of gear teeth, anda pinion rod extending through the smooth opening of the stripper plateand having teeth meshing with the teeth of the lock nut, said pinion rodseating on the shroud.

3. The combination, with a stripper plate and die shoe. spaced apart,said stripper plate having a. threaded opening and a-smooth-walledopening adjacent said threaded opening, the die shoe having acounterbored smooth-walled opening, and with a capscrew seated in thecounterbored opening of the die shoe and threaded in the threadedopening of. the stripper plate, of a circular lock nut threaded on thecap screw, one end of. said lock nut being formed with a circumferentialseries of gear teeth, the other end of said lock nut being formed withan annular shroud constituting a wrench stop, an elongated pinion rodextending; through the. smooth-.- walled. opening of. the stripperplate, that p,or-. tion of the pinioncrod, extending through. the;stripper plate being. formed with a circumferential series of spur gearteeth, and meansatthe;

other end. of, the. pinionrod for rotating. said pinion rod after. the.gear teeth of. the. rod. are

in mesh. With the. teeth of. the. lock. 111113,,Said, shroudconstituting; a. stop for. the. first-named.

end. of thepinion rod.

VENE. T. LOCKARDL.

REFERENCES CITED The. following references are; ofv record: in-.th.e':file of. this. patent;

UNITED STATES PATENTS

